I'm trying to update my 3.55 kmeaw to the new rogero v2 cfw using this guide (guide in the spoiler). Everything went well, until I got to the last step(the actual installation of the new cfw). At that point all I'm getting is a data damaged 8002F157 error, and it refuses to update.
So I did some digging around, and found that most people said to install the 3.55 OFW before updating to Rogero v2. So now I want to be sure that this is the correct course of action before doing so (especially because the recovery mode says to only use updates higher than 4.11).

And, while I'm at it, I'm confused by step 5 (dehashing), is that really all there is to that step or am I missing something.

Step 2 - Preparing USB stick (folders)Spoiler:
Create a folder called PS3, within that folder create a folder called UPDATE.
So it will be like this - USB\PS3\UPDATE\

Step 3 - Transfer filesSpoiler:
MultiMan and any other pkg files you need to install should be copied to the root of your USB. (ie in no folder)
Then Copy and paste Rogero's latest CFW into the UPDATE folder. (eg USB\PS3\UPDATE\Rogero_CEX_4.30_v2.03.PUP)
Once copied, rename it to PS3UPDAT.PUP
Now run MD5 checks, very important! (refer to md5 check & sums above)

Step 4 - Installing pkg files - latest multiMAN, installpkg, toggle_QA etc...Spoiler:
From XMB (ps3 menu), scroll over to games section and click on install packages.
One by one click and install all.
First install installPKG and then install multiMAN ver 04.17.00 and then multiMAN ver 04.18.0 (UPD) and so on.

Step 5 - DehashingSpoiler:

Note: Dehashing is for 3.55CFW, it won't work in CFW4.21/CFW4.30, don't worry, if your on CFW4.21/CFW4.30 you can simply skip it.

Go to Game XMB and if you scroll down you should see Toggle_QA.
Click on it, your screen will go black and it will reboot into XMB.
Now go to network settings, don't click into it, just hover or highlight over it.
Then all at once press the following combo - L1 + L2 + L3 (press left stick) + R1 + R2 + dpad_down
You should see Edy Viewer, Debug Settings, and Install Package Files if done correctly.
If you do not see it, run the Toggle_QA program again until you see it.

Note: You need to have atleast one PS3 game on your HDD. Note: If you do not, you can either FTP a game to it or you can run multiMAN, insert any original PS3 game, hover over the game and press triangle, then click on install (or backup).Note: Once you've created that backup, take out the disc and proceed with the tutorial.

1. Insert a FAT32 formatted USB to the right-side port of your ps3 and run multiman.
2. After it loads , start file manager( its an option that is there in Multiman)
(NOTE: shortcut to start multiman's file manager SELECT+START)
3.when using file manager , go to to /dev_hdd/GAMES/* any game u have*/
( example: /dev_hdd/GAMES/CODBOP2/)
and open the PS3_DISK.SFB file(or the param.sfo file of the game) by pressing 'X' 2 times on it.
4. after u open the .SFB file u can see a lot of numbers ,shown in a hex-decimal form,
as shown in the image
press SELECT and u will get a LV2 View.
5. when on LV2 view press start , (that is after we pressed select in step 4.)
6. you will then get a message " Do u want to export GAMEOS LV2 memory to a file",press no, then it will show a message asking " Do u want to export HV LV1 memory to a file" say no for this as well, and then u will get a 3rd message asking "Do u want to export FLASH memory to a file" say yes to this.and it will start the dumbing process.the dumb will be saved to the root of ur usb.
7. you can now exit multiman, disconnect the usb from ur ps3 and connect it to your pc,
and inside the USB u can find a file named 201***FLASH-NOR-FW.3.55.NORBIN (if ur ps3 has NOR) or 201***FLASH-NAND-FW.3.55.NANDBIN( if ur ps3 is having NAND).

Transfer nand/nor back up to your computer and keep it safe.

Step 7 - Installing 4.30CFW Rogero v2.03Spoiler:
Make sure there is no disc in BD and that no internet connection is available.
Plug your USB to your PS3.
Then go to system update in XMB and from there select mass storage.
Your done installing

I did the upgrade the other day to 4.30 2.03 using Rogero instructions on tortuga-cove with no issue. You shouldn't have to dehash, especially if you haven't downgraded from 4.11 or 4.21.

I took me a couple of tries to toggle QA successfully, and I did read that there was an issue with the ftp at psx-scene for latest version. Follow the instructions to verify the MD5 is correct, I'm using winmd5.exe.

I did not try the upgrade until I verified the qa-toggle was successful, but I am niot sure it would really matter, more likely bad download.

No I did downgrade the ps3 (from 4.11 I think), and I get why it has to be dehashed. I'm just not sure if the step thats outlined in the guide is all I have to do (toggle it and nothing else). And I verified the download using the MD5, so I'm pretty sure the download itself is fine (I got it twice, from two different sites as wel, just to be sure).

Most dehashing guides seems to referring to be needed if you are using a Rogero 3.55 CFW to have the syscon hashes reset. Kmeaw has them reset already as far as I understand. Please see guide below, which says to instal kmeaw or OFW after qa_toggle. Interesting is says it should be done through recover menu, I do not know if you installed kmeaw through recoery or XMB.